Last updated on March 10th, 2025 at 10:59 pm

Here, we see the Project Employees II LeetCode Solution. This Leetcode problem is solved using MySQL and Pandas.

List of all LeetCode Solution

Level of Question

Easy

Project Employees II LeetCode Solution

1. Problem Statement

Column Name	Type
project_id	int
employee_id	int

(project_id, employee_id) is the primary key of this table. employee_id is a foreign key to Employee table. Each row of this table indicates that the employee with employee_id is working on the project with project_id.

Column Name	Type
employee_id	int
name	varchar
experience_years	int

employee_id is the primary key of this table. It’s guaranteed that experience_years is not NULL. Each row of this table contains information about one employee.

Write an SQL query that reports all the projects that have the most employees.

The query result format is in the following example:

Example 1:
Input:

project_id	employee_id
1	1
1	2
1	3
2	1
2	4

employee_id	name	experience_years
1	Khaled	3
2	Ali	2
3	John	1
4	Doe	4

Output:

project_id

1

Explanation: The first project has 3 employees while the second one has 2.

2. Code Implementation in Different Languages

2.1 Project Employees II MySQL

select 
  project_id 
from 
  Project 
group by 
  project_id 
having 
  count(employee_id) >= (
    select 
      count(employee_id) as cnt 
    from 
      Project 
    group by 
      project_id 
    order by 
      cnt desc 
    limit 
      1
  );